/*	$OpenBSD: err.c,v 1.2 2002/06/25 15:50:15 mickey Exp $	*/

/*
 * log.c
 *
 * Based on err.c, which was adapted from OpenBSD libc *err* *warn* code.
 *
 * Copyright (c) 2005 Nick Mathewson <nickm@freehaven.net>
 *
 * Copyright (c) 2000 Dug Song <dugsong@monkey.org>
 *
 * Copyright (c) 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef HAVE_CONFIG_H
#include <config.h>
#endif

#ifdef WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#undef WIN32_LEAN_AND_MEAN
#include <misc.h>
#endif
#include <sys/types.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#else
#include <sys/_time.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <event.h>

#include <log.h>

static void _warn_helper (int severity, int log_errno, const char *fmt,
                          va_list ap);
static void event_log (int severity, const char *msg);

static int
event_vsnprintf (char *str, size_t size, const char *format, va_list args)
{
  int r;

  if (size == 0)
    return -1;

#ifdef WIN32
  r = _vsnprintf (str, size, format, args);

#else
  r = vsnprintf (str, size, format, args);

#endif
  str[size-1] = '\0';

  if (r < 0 || ( (size_t) r) >= size)
    {
      /* different platforms behave differently on overflow;
       * handle both kinds. */
      return -1;
    }

  return r;
}

static int
event_snprintf (char *str, size_t size, const char *format, ...)
{
  va_list ap;
  int r;
  va_start (ap, format);
  r = event_vsnprintf (str, size, format, ap);
  va_end (ap);
  return r;
}

void
event_err (int eval, const char *fmt, ...)
{
  va_list ap;

  va_start (ap, fmt);
  _warn_helper (_EVENT_LOG_ERR, errno, fmt, ap);
  va_end (ap);
  exit (eval);
}

void
event_warn (const char *fmt, ...)
{
  va_list ap;

  va_start (ap, fmt);
  _warn_helper (_EVENT_LOG_WARN, errno, fmt, ap);
  va_end (ap);
}

void
event_errx (int eval, const char *fmt, ...)
{
  va_list ap;

  va_start (ap, fmt);
  _warn_helper (_EVENT_LOG_ERR, -1, fmt, ap);
  va_end (ap);
  exit (eval);
}

void
event_warnx (const char *fmt, ...)
{
  va_list ap;

  va_start (ap, fmt);
  _warn_helper (_EVENT_LOG_WARN, -1, fmt, ap);
  va_end (ap);
}

void
event_msgx (const char *fmt, ...)
{
  va_list ap;

  va_start (ap, fmt);
  _warn_helper (_EVENT_LOG_MSG, -1, fmt, ap);
  va_end (ap);
}

void
_event_debugx (const char *fmt, ...)
{
  va_list ap;

  va_start (ap, fmt);
  _warn_helper (_EVENT_LOG_DEBUG, -1, fmt, ap);
  va_end (ap);
}

static void
_warn_helper (int severity, int log_errno, const char *fmt, va_list ap)
{
  char buf[1024];
  size_t len;

  if (fmt != NULL)
    event_vsnprintf (buf, sizeof (buf), fmt, ap);
  else
    buf[0] = '\0';

  if (log_errno >= 0)
    {
      len = strlen (buf);

      if (len < sizeof (buf) - 3)
        {
          event_snprintf (buf + len, sizeof (buf) - len, ": %s",
                          strerror (log_errno) );
        }
    }

  event_log (severity, buf);
}

static event_log_cb log_fn = NULL;

void
event_set_log_callback (event_log_cb cb)
{
  log_fn = cb;
}

static void
event_log (int severity, const char *msg)
{
  if (log_fn)
    log_fn (severity, msg);
  else
    {
      const char *severity_str;

      switch (severity)
        {

          case _EVENT_LOG_DEBUG:
            severity_str = "debug";
            break;

          case _EVENT_LOG_MSG:
            severity_str = "msg";
            break;

          case _EVENT_LOG_WARN:
            severity_str = "warn";
            break;

          case _EVENT_LOG_ERR:
            severity_str = "err";
            break;

          default:
            severity_str = "???";
            break;
        }

      (void) fprintf (stderr, "[%s] %s\n", severity_str, msg);
    }
}
